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Which of the following compounds gives b...

Which of the following compounds gives blood red colouration when its Lassaigne's extract is treated with alkali and ferric chloride .

A

Thiourea

B

Diphenyl sulphide

C

Phenyl hydrazine

D

Benzamide

Text Solution

Verified by Experts

The correct Answer is:
A
Thiourea contains both S and N and hence gives blood red colouration when its Lassaigne.s extract is treated with alkali and `FeCl_(3)`.
`3NaCNS + FeCl_(3) to underset("Ferric sulphocyanide Blood red")(Fe(CNS)_(3)) + 3NaCl`
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